Abstract: The present invention is related to an improved structure of an acupuncture acus, especially a multiple safety acupuncture acus provided with a bellow protector. The grip of the said acupuncture acus is produced by injection molding and is in the form of a cone flange which can be engaged exactly by a protective sleeve for convenience of packing; a bellow type protector is built from the adjoining position between the acupuncture acus and the grip to the needle head; the end of the protector is in the form of a hollow ring, its inside ring is made of membrane, while its outer ring is made of soft plastic.

Abstract: A cylinder lock includes a cylindrical housing connected with a circular insert at its bottom to receive therein a movable barrel and a fixed barrel. A plurality of lock pin assemblies are set in a plurality of pin holes vertically through the movable lock barrel to control the connection of the movable lock barrel with the fixed lock barrel by use of the various stepped pins of an authorized key. The stepped pins can be detached from the key for keeping separately.